Abstract Through the analysis of the trend changes of 28 measurement items of 11 sets of tiltmeters at 6 stations within 100 km near the Lintan-Tanchang fault zone, it can be found that in the first three years after earthquake, the trend changes of most of the observation data showed different degrees of anomalies. Especially during the period of 2008-2022, the Tanchang DSQ-EW component showed an eastward-dipping trend at a certain rate(the annual trend is obvious), and there were two obvious abnormal changes in the trend during this period(from the east-dipping trend changed to a west-dipping trend), about half a year(7 months and 5 months) after these two turning points, moderately strong earthquakes occurred near the Lintan-Tanchang fault(Minxian-Zhangxian MS6.6 earthquake and Xiahe MS5.7 earthquake), and after the earthquake, the observation data basically returned to the original trend.
